nixos/networkd: make wait-online not time out

A further bug to our strange multi-user.target depending on
network-online.target issue is that systemd recently changed the
behaviour of systemd-networkd-wait-online to no longer consider the
absence of interfaces with RequiredForOnline to be sufficient to be
online: https://github.com/systemd/systemd/pull/27825

On the advice of the systemd developers
(https://github.com/systemd/systemd/issues/29388), this commit changes
the configuration of systemd-networkd-wait-online to pass --any by
default, and lets the default DHCP interfaces be RequiredForOnline
as they would be by default if the option is omitted.

It is plausible that systemd-networkd-wait-online may still fail if
there are no interfaces at all. However, that probably cannot be
avoided.

nixos/doc/manual/release-notes/rl-2311.section.md

@@ -91,6 +91,9 @@
 
 ## Backward Incompatibilities {#sec-release-23.11-incompatibilities}
 
+- `network-online.target` has been fixed to no longer time out for systems with `networking.useDHCP = true` and `networking.useNetworkd = true`.
+  Workarounds for this can be removed.
+
 - The `boot.loader.raspberryPi` options have been marked deprecated, with intent for removal for NixOS 24.11. They had a limited use-case, and do not work like people expect. They required either very old installs ([before mid-2019](https://github.com/NixOS/nixpkgs/pull/62462)) or customized builds out of scope of the standard and generic AArch64 support. That option set never supported the Raspberry Pi 4 family of devices.
 
 - `python3.pkgs.sequoia` was removed in favor of `python3.pkgs.pysequoia`. The latter package is based on upstream's dedicated repository for sequoia's Python bindings, where the Python bindings from [gitlab:sequoia-pgp/sequoia](https://gitlab.com/sequoia-pgp/sequoia) were removed long ago.

nixos/modules/system/boot/networkd.nix

@@ -2724,9 +2724,12 @@ let
         description = lib.mdDoc ''
           Whether to consider the network online when any interface is online, as opposed to all of them.
           This is useful on portable machines with a wired and a wireless interface, for example.
+
+          This is on by default if {option}`networking.useDHCP` is enabled.
         '';
         type = types.bool;
-        default = false;
+        defaultText = "config.networking.useDHCP";
+        default = config.networking.useDHCP;
       };
 
       ignoredInterfaces = mkOption {

nixos/modules/tasks/network-interfaces-systemd.nix

@@ -59,23 +59,14 @@ let
       # more likely to result in interfaces being configured to
       # use DHCP when they shouldn't.
 
-      # When wait-online.anyInterface is enabled, RequiredForOnline really
-      # means "sufficient for online", so we can enable it.
-      # Otherwise, don't block the network coming online because of default networks.
       matchConfig.Name = ["en*" "eth*"];
       DHCP = "yes";
-      linkConfig.RequiredForOnline =
-        lib.mkDefault (if initrd
-        then config.boot.initrd.systemd.network.wait-online.anyInterface
-        else config.systemd.network.wait-online.anyInterface);
       networkConfig.IPv6PrivacyExtensions = "kernel";
     };
     networks."99-wireless-client-dhcp" = {
       # Like above, but this is much more likely to be correct.
       matchConfig.WLANInterfaceType = "station";
       DHCP = "yes";
-      linkConfig.RequiredForOnline =
-        lib.mkDefault config.systemd.network.wait-online.anyInterface;
       networkConfig.IPv6PrivacyExtensions = "kernel";
       # We also set the route metric to one more than the default
       # of 1024, so that Ethernet is preferred if both are